Jump to content
Sign in to follow this  

150psi Comp in a 2003 KX125 o.k?

Recommended Posts

  I have been refurbishing an beat down 2003 KX 125 I bought recently. When I put the new Wiseco piston kit in, I got a little carried away when I filed the rings for proper ring gap. It ended up at .024. I was a bit disappointed but I went and threw it together anyways.

 

  Before the new top end the compression was 120 PSI, and this was with an incorrect Wiseco piston for a 2004 KX125 (different part number).

 

  After the new kit and my generous ring gap, it went up 30 PSI to 150 PSI.

 

  For a comparison I have a modded  2005 YZ125 that has a ported cylinder, Wiseco GP piston and head mods that I have to run Avgas/Racegas in and its compression is at 170 with 3 hours of run time. All readings were made with the same compression gauge.

 

 

  My question is, will 150 psi be o.k for a bit? If I have to, I will re-ring it. I just wanted to get your opinions on it. I did feel better after the compression reading compared to my modded YZ's reading of 170, but I am not sure that's a good comparison.

 

  Thanks,

       Jeff

Share this post


Link to post
Share on other sites

150 is your bottom limit and be changed at that point. Like blackwoods said. You shouldnt have touched it.

Share this post


Link to post
Share on other sites

I had no choice but to file them, I couldn't even fit the .010 gauge in. I just ordered the stuff to re-ring it so all will be well this weekend.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Reply with:

Sign in to follow this  

×
×
  • Create New...